What does code P2390 mean?

Q: What does code P2390 mean?

Diesel Intake Air Flow B Control Circuit Open. P2390 indicates that the engine control module has detected an open circuit on the control wire for the diesel intake air flow control valve, which is used to regulate intake air swirl or throttle for efficient combustion. The circuit is monitored for continuity, and an open means the valve cannot be commanded, often triggering a limp mode or reduced power.

DTC codes / P23xx · Ignition system and misfire / P2390

P2390Diesel Intake Air Flow B Control Circuit Open

P2390 indicates that the engine control module has detected an open circuit on the control wire for the diesel intake air flow control valve, which is used to regulate intake air swirl or throttle for efficient combustion. The circuit is monitored for continuity, and an open means the valve cannot be commanded, often triggering a limp mode or reduced power.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.